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Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Non-current investments [Abstract] |  |
Equity and fixed income mutual funds | $ 843 | $ 839
Life insurance policies | 5,385 | 5,493
Equity-method investments | 0 | 349
Other (primarily cost-method) investments | 16,387 | 16,395
Total non-current investments | $ 22,615 | $ 23,076

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